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Selective Deposition of Insulating Metal Oxide in Perovskite Solar Cells with Enhanced Device Performance
Author(s) -
Yue Youfeng,
Yang Xudong,
Wu Yongzhen,
Salim Noviana Tjitra,
Islam Ashraful,
Noda Takeshi,
Han Liyuan
Publication year - 2015
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201500518
Subject(s) - perovskite (structure) , materials science , oxide , deposition (geology) , metal , chemical engineering , nanotechnology , photovoltaics , atomic layer deposition , thin film , photovoltaic system , metallurgy , paleontology , sediment , engineering , biology , ecology
We report a simple methodology for the selective deposition of an insulating layer on the nanoparticulate TiO 2 (np‐TiO 2 ) mesoporous layer of perovskite solar cells. The deposited MgO insulating layer mainly covered the bottom part of the np‐TiO 2 layer with less coverage at the top. The so‐called quasi‐top‐open structure is introduced to act as an efficient hole‐blocking layer to prevent charge recombination at the physical contact of the transparent conducting oxide with the perovskite. This leads to an open‐circuit voltage higher than that of the reference cell with a compact TiO 2 hole‐blocking layer. Moreover, such a quasi‐top‐open structure can facilitate the electron injection from perovskite into the np‐TiO 2 mesoporous layer and improve the spectral response at longer wavelength because of the less covered insulating layer at the top. This work provides an alternative way to fabricate perovskite solar cells without the need to use a conventional compact TiO 2 layer.